Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efe5dc70c2f89f0…

MALICIOUS

PDF

68.3 KB Created: 2020-12-21 07:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faeb16ff65ab8788cbf4f41929b7a239 SHA-1: 5427ad0f011baa36f212120214329db1941fbf4e SHA-256: 8efe5dc70c2f89f08360ba9ccc1e13c61e1f20aa1770799eca0180ac91e3b8cd
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one that redirects to known malicious infrastructure, disguised as a download for 'My talking tom cat download apk'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the link farm heuristic suggest an attempt to generate traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?utm_term=my+talking+tom+cat+download+apk
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f8d1c3e4cfcd.pdf
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/pugamukusog_jexube_fuwoxiginor_tufuzudokumuw.pdf
    • https://buserakufazuwus.weebly.com/uploads/1/3/4/0/134097478/6553377.pdf
    • https://cdn-cms.f-static.net/uploads/4446275/normal_5fd1b8404a6a8.pdf
    • https://cdn-cms.f-static.net/uploads/4454041/normal_5fdbe5267b7fe.pdf
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f9af0f359b81.pdf
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5f94affa66cff.pdf
    • https://cdn-cms.f-static.net/uploads/4494661/normal_5fc1f7ba9f856.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/69899eed-8b51-4c64-9adc-4de8d64e9b0b/nurse_t_shirts_cheap.pdf
    • https://s3.amazonaws.com/luropi/pinehurst_lifestyle_crib_instructions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1ba.bin
0ecfb8eeb562bc3c2fb05b2f5bd549a25b90856e76ecc5fe5b1fbd0a40eaa87e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BA 5384 bytes
font_01_sfnt_off0000d422.bin
0c54f9d70c57eeefc29c179a1c75a1388f5c5e7b5183608b1ecc2310d77cf75e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 1924 bytes
font_02_sfnt_off0000dd4b.bin
9230422106ebe582e856db255d5583e2994aa137f0739d073f8545ae19c75e2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 11536 bytes